Abstract: A nuclear magnetic resonance imaging system comprising a high field solenoidal magnet providing a uniform static magnetic field surrounding a subject, an RF coil surrounding the subject, a receiver coil surrounding the subject, and a cylindrical shell of magnetic material surrounding the magnet and the RF and receiver coils. The shell is positioned such that the wall thereof lies in the area of the field of the magnet where the shell's permeability is substantially at a maximum for the imposed field such that the shell functions to substantially confine the field of the magnet to an area about the shell and the environment is not adversely affected and no additional protection is required surrounding the system.

Abstract: An emergency warning lamp comprising a base, a mounting plate mounted on the base, and an electric motor mounted on the plate having an output shaft extending upwardly through the plate. A bushing is disposed centrally of the base on the plate, and a plastic gear is rotatably mounted on the bushing. A pinion meshes with the gear and is fixed to the shaft of the motor. A lamp bulb is mounted on the bushing. A heat shield overlies the gears and is supported by one of the gears for rotation. A reflector is mounted on the heat shield for rotation therewith. Electrical leads extend from a source of power, one of the leads comprising a ground lead and the others comprising power leads. One of the power leads extends through the bushing to the lamp. The other of the power leads extends to the winding of the motor. The housing of the motor is grounded to the metal plate and the ground lead is connected to the metal plate. The current flows through the bulb to the bushing and in turn to the mounting plate.